Diamonds from Coal? They form under several conditions that rarely involve coal.
What Is Jade?
What Is Jade? Learn about the uses of jade. It has been used to make ornaments and tools for thousands of years..
Synthetic Diamonds
Synthetic Diamonds: Large, nearly-flawless diamonds are now possible with chemical vapor deposition.
Amazing Agate Photos
Beautiful Photos of Agates: A gallery of spectacular agate photos and descriptions prepared by Professor Richard Weston.
Herkimer "Diamonds"
Herkimer "Diamonds": These doubly-terminated quartz crystals have been given the popular name "Herkimer Diamonds."
Diamond: The Mineral
Diamond: Learn about the properties of diamonds and their many uses. Diamonds are much more than jewelry!
Ametrine Gemstones
Ametrine The Bicolor Amethyst Ametrine is the name used when a single crystal of quartz has zones of gemstone quality amethyst (purple) and gemstone quality citrine (golden) in contact with one another.
Corundum
Uses of Corundum: Corundum is a very interesting mineral. It is an exceptionally hard aluminum oxide that forms in igneous and metamorphic rocks.
